Fuse size

T edward · 23rd July 2006, 03:30 PM

I have an Arc 400.4 power amp and I'm going to wire it up on Tuesday. What size fuse should I use on 12V + cable? The amp draws 46A @ 380 watts. Tom Daugherty

djQUAN · 23rd July 2006, 03:43 PM

you could go for a 40A if you're not going to push it hard, if you will, use 50A.

T edward · 23rd July 2006, 03:45 PM

Thanks.

sr20dem0n · 23rd July 2006, 05:09 PM

Are you talking about the fuse by the battery?

It depends on the cable you're using, not the amp. I'm assuming you're using 4awg, if so then any fuse below ~120 amps will work fine. If you're using 8awg then any fuse below ~80 amps will work fine. Those are the upper limits, you want to stay below that and above the amp's normal draw so it doesn't blow under normal circumstances. In your case, above 50 would be fine, however you might as well just fuse at the max your wire will safely support so that you don't have to replace it if you add another amp or replace your current amp sometime in the future.

23rd July 2006, 03:30 PM	#1
T edward diyAudio Member Join Date: May 2006	Fuse size I have an Arc 400.4 power amp and I'm going to wire it up on Tuesday. What size fuse should I use on 12V + cable? The amp draws 46A @ 380 watts. Tom Daugherty

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23rd July 2006, 03:43 PM	#2
djQUAN diyAudio Member Join Date: May 2004 Location: manila	you could go for a 40A if you're not going to push it hard, if you will, use 50A.

23rd July 2006, 03:45 PM	#3
T edward diyAudio Member Join Date: May 2006	Thanks.

23rd July 2006, 05:09 PM	#4
sr20dem0n diyAudio Member Join Date: Apr 2005 Location: Broomfield, CO	Are you talking about the fuse by the battery? It depends on the cable you're using, not the amp. I'm assuming you're using 4awg, if so then any fuse below ~120 amps will work fine. If you're using 8awg then any fuse below ~80 amps will work fine. Those are the upper limits, you want to stay below that and above the amp's normal draw so it doesn't blow under normal circumstances. In your case, above 50 would be fine, however you might as well just fuse at the max your wire will safely support so that you don't have to replace it if you add another amp or replace your current amp sometime in the future.

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